WELCOME FRIENDS!!

WELCOME  FRIENDS!!
HUMMINGBIRD MIGRATION 2014
Showing posts with label Wikipedia Info shared. Show all posts
Showing posts with label Wikipedia Info shared. Show all posts

Sunday, August 31, 2014

CASSIDY DOES NOT EAT SNAKES! ESPECIALLY: NO COPPERHEADS!



Hi Everybody!!
You may think a headless snake is a bizarre opening photo and you would be correct!  As you know, I have a one leg buzzard who has moved in to the memory garden. I have been feeding birds for many years, but I have never fed the buzzards as they go hunt then return at night. They eat dead animals, not living ones. So this copperhead snake was experiment 104 of what does Cassidy like to eat. I chopped the head off and buried it (like Dad taught me).  Anyway,  I put the fresh dead snake on her picnic table for lunch. She did not eat it. She threw it on the ground. I am marking snake off the menu board for Cassidy. I have shared info below from Wikipedia about copperhead snakes. If you live near or go to woods in the South (States), you really should know about this snake.






https://en.wikipedia.org/wiki/Agkistrodon_contortrix

Agkistrodon contortrix

From Wikipedia, the free encyclopedia
Agkistrodon contortrix is a species of venomous snake endemic to North America, a member of the Crotalinae (pit viper) subfamily. The common name for the species is the copperhead. The behavior of Agkistrodon contortrix may lead to accidental encounters with humans. Five subspecies are currently recognized, including the nominate subspecies described here.[2]
Agkistrodon contortrix
Copperhead05.jpg
Conservation status
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Subphylum:Vertebrata
Class:Reptilia
Order:Squamata
Suborder:Serpentes
Family:Viperidae
Subfamily:Crotalinae
Genus:Agkistrodon
Species:A. contortrix
Binomial name
Agkistrodon contortrix
(Linnaeus, 1766)
Agkistrodon contortrix range.png

Description[edit]


Detail of head
Adults usually grow to a total length (including tail) of 50–95 cm (20–37 in), although some may exceed 1 m (3.3 ft). Males are usually larger than females. The maximum length reported for this species is 134.6 cm (53.0 in) for A. c. mokasen (Ditmars, 1931). Brimley (1944) mentions a specimen of A. c. mokasen from Chapel Hill, North Carolina, that was "four feet, six inches" (137.2 cm), but this may have been an approximation. The maximum length for A. c. contortrix is 132.1 cm (52.0 in) (Conant, 1958).[3]
The body is relatively stout and the head is broad and distinct from the neck. Because the snout slopes down and back, it appears less blunt than that of the cottonmouth, A. piscivorus. Consequently, the top of the head extends further forward than the mouth.[4]
The scalation includes 21–25 (usually 23) rows of dorsal scales at midbody, 138–157 ventral scales in both sexes and 38–62/37–57 subcaudal scalesin males/females. The subcaudals are usually single, but the percentage thereof decreases clinally from the northeast, where about 80% are undivided, to the southwest of the geographic range where as little as 50% may be undivided. On the head there are usually 9 large symmetrical plates, 6–10 (usually 8) supralabial scales and 8–13 (usually 10) sublabial scales.[3]
The color pattern consists of a pale tan to pinkish tan ground color that becomes darker towards the foreline, overlaid with a series of 10–18 (13.4) crossbands. Characteristically, both the ground color and crossband pattern are pale in A. c. contortrix. These crossbands are light tan to pinkish tan to pale brown in the center, but darker towards the edges. They are about 2 scales wide or less at the midline of the back, but expand to a width of 6–10 scales on the sides of the body. They do not extend down to the ventral scales. Often, the crossbands are divided at the midline and alternate on either side of the body, with some individuals even having more half bands than complete ones. A series of dark brown spots is also present on the flanks, next to the belly, and are largest and darkest in the spaces between the crossbands. The belly is the same color as the ground color, but may be a little whitish in part. At the base of the tail there are 1–3 (usually 2) brown crossbands followed by a gray area. In juveniles, the pattern on the tail is more distinct: 7–9 crossbands are visible, while the tip is yellow. On the head, the crown is usually unmarked, except for a pair of small dark spots, one near the midline of each parietal scale. A faint postocular stripe is also present; diffuse above and bordered below by a narrow brown edge.[4]
Several aberrant color patterns for A. c. contortrix, or populations that intergrade with it, have also been reported. In a specimen described by Livezey (1949) from Walker County, Texas, 11 of 17 crossbands were not joined middorsally, while on one side three of the crossbands were fused together longitudinally to form a continuous undulating band, surmounted above by a dark stripe that was 2–2.5 scales wide. In another specimen, fromLowndes County, Alabama, the first three crossbands were complete, followed by a dark stripe that ran down either side of the body, with points of pigment reaching up to the midline in six places but never getting there, after which the last four crossbands on the tail were also complete. A specimen found in Terrebonne Parish, Louisiana by Ernest A. Liner, had a similar striped pattern, with only the first and last two crossbands being normal.[4]

Common names[edit]

Common names for A. contortrix include: copperhead (snake), chunk head, death adder,[citation needed] highland moccasin, (dry-land) moccasin, narrow-banded copperhead, northern copperhead, pilot snake, poplar leaf, red oak, red snake, southeastern copperhead, white oak snake,[5]American copperhead,[6] southern copperhead,[4] and cantil cobrizo (Spanish).[2]

Geographic range[edit]

It is found in the United States in the states of AlabamaArkansasConnecticutDelawareFloridaGeorgiaIllinoisIndianaIowaKansasKentucky,LouisianaOhioOklahomaMarylandMassachusettsMississippiMissouriNew JerseyNew YorkNorth CarolinaPennsylvaniaSouth Carolina,TennesseeTexasVirginia and West Virginia. In Mexico, it occurs in Chihuahua and Coahuila. The type locality is "Carolina". Schmidt (1953) proposed the type locality be restricted to "Charleston, South Carolina".[1]
Unlike some other species of North American pit vipers, such as Crotalus horridus and Sistrurus catenatusAgkistrodon contortrix has not reestablished itself north of the terminal moraine after the last glacial period (the Wisconsin glaciation),[7] except it is found in southeastern New York State and southern New England, an area north of Long Island (the terminal moraine of the Wisconsin glaciation).

Habitat[edit]

Within its range it occupies a variety of different habitats. In most of North America it favors deciduous forest and mixed woodlands. It is often associated with rock outcroppings and ledges, but is also found in low-lying swampy regions. During the winter it hibernates in dens, in limestone crevices, often together with Timber Rattlesnakes and Black Rat Snakes. In the states around the Gulf of Mexico, however, this species is also found inconiferous forest. In the Chihuahuan Desert of west Texas and northern Mexico, it occurs in riparian habitats, usually near permanent or semipermanent water and sometimes in dry arroyos (brooks).[3]

Conservation status[edit]

This species is classified as Least Concern (LC) on the IUCN Red List of Threatened Species (v3.1, 2001).[8] Species are listed as such due to their wide distribution, presumed large population, or because it is unlikely to be declining fast enough to qualify for listing in a more threatened category. The population trend was stable when assessed in 2007.[9]

Behavior[edit]


Southern copperhead, A. c. contortrix, at the southern limit of its range, in Liberty Co., Florida, camouflaged in dead leaves
Like all pit vipersA. contortrix is generally an ambush predator: it takes up a promising position and waits for suitable prey to arrive. One exception to ambush foraging occurs when copperheads feed on insects such as caterpillars and freshly molted cicadas. When hunting insects, copperheads actively pursue their prey.[10] Juveniles use a brightly colored tail to attract frogs and perhaps lizards, a behavior termed caudal luring (see video: [1]). In the southern United States, they are nocturnal during the hot summer months, but are commonly active during the day during the spring and fall.
Like most North American viperids, these snakes prefer to avoid humans and, given the opportunity, will leave the area without biting. However, unlike other viperids they will often "freeze" instead of slithering away, and as a result many bites occur from people unknowingly stepping on or near them.[11] This tendency to freeze most likely evolved because of the extreme effectiveness of their camouflage. When lying on dead leaves or red clay, they can be almost impossible to notice. They will frequently stay still even when approached closely, and will generally strike only if physical contact is made.

Feeding[edit]

Roughly 90% of its diet consists of small rodents, such as mice and voles. They have also shown fondness for large insects and frogs, and though highly terrestrial, have been known to climb trees to gorge on emerging cicadas.

Reproduction[edit]

A. contortrix breeds in late summer, but not every year: sometimes a female will produce young for several years running, then not breed at all for a time. They give birth to live young, each of which is about 20 cm (7.9 in) in total length. The typical litter size is 4 to 7, but there can be as few as one, or as many as 20. Their size apart, the young are similar to the adults, but lighter in color, and with a yellow-marked tip to the tail, which is used to lure lizards and frogs.
A study has shown that A. contortrix males have longer tongue tine lengths than females during the breeding season which may aid in chemoreception of males searching for females.[12]

Venom[edit]

Although venomous, these snakes are generally not aggressive and bites are rarely fatal.[citation needed] Copperhead venom has an estimated lethal dose of around 100 mg, and tests on mice show its potency is among the lowest of all pit vipers, and slightly weaker than that of its close relative, the cottonmouth.[citation needed] Copperheads often employ a "warning bite" when stepped on or agitated and inject a relatively small amount of venom, if any at all. "Dry bites" involving no venom are particularly common with the copperhead, though all pit vipers are capable of a dry bite.[citation needed]
Bite symptoms include extreme pain, tingling, throbbing, swelling, and severe nausea. Damage can occur to muscle and bone tissue, especially when the bite occurs in the outer extremities such as the hands and feet, areas in which there is not a large muscle mass to absorb the venom. A bite from any venomous snake should be taken very seriously and immediate medical attention sought, as allergic reaction and secondary infection are always possible.
The venom of the southern copperhead has been found to hold a protein called "contortrostatin" that halts the growth of cancer cells in mice and also stops the migration of the tumors to other sites.[13] However, this is an animal model, and further testing is required to verify safety and efficacy in humans.[14]
Although technically the antivenin CroFab could be used to treat an envenomation, it is usually not administered for copperheads, as the risk of complications of an allergic reaction to the treatment are greater than the risk from the snakebite itself in most cases. The antivenin can cause an immune reaction called serum sickness, which can consist of bouts of flu like symptoms for 1-12 months. Pain management, antibiotics, and medical supervision in the case of complications is usually the course of action.[15] In 2002, an Illinois poison control center report on the availability of antivenin stated it used 1 Acp to 5 Acp depending on the symptoms and circumstances. The symptoms of a mild envenomation include swelling of the hand, mild cellulitis, and respiratory distress. The symptoms of a moderate envenomation would include swelling of the hand, vomiting, mild bleeding, ecchymosisdiaphoresissinus tachycardia, and hypotensia.[16]




https://plus.google.com/u/0/photos/117645114459863049265/albums/6053444711644771505











 







link to G+ photo albums:
https://plus.google.com/u/0/photos/117645114459863049265/albums/6053449135361597873


...this is brendasue signing off from Rainbow Creek.  See you next time! If you venture into the southern woods, watch out for the copperheads.

O+O

Tuesday, August 26, 2014

A RARE SUMMER VISITOR IN JULY: THE POLAR VORTEX




Hi Everybody!!
Great News from Texas: This is the first summer in 4 years that we have had clouds and more rain than last 3 summers combined. Here are photos of the rare July Summer Cold Front dancing across Texas. It did not get cold, but provided welcome rain and a few degrees less hot. I have shared Wikipedia info below about the Polar Vortex that brought the cold front to S. Texas.  Polar Vortex may be a new term in the media, but it was discovered long ago in 1952 (when I was 2 years old!). Yes, to keep up in the New World, we must learn many new things. Thanks to Google, it is possible to learn all you want! Enjoy!




https://plus.google.com/u/0/photos/117645114459863049265/albums/6035275437437477905


https://www.google.com/search?q=rare+summer+cold+front&tbm=isch&tbo=u&source=univ&sa=X&ei=elj8U5ylD9etyASg6IL4Bw&ved=0CDAQsAQ&biw=1440&bih=775#facrc=_&imgdii=_&imgrc=bRsLTiiIZBgrxM%253A%3BewzwIliRstpgZM%3Bhttp%253A%252F%252Fthescoopblog.dallasnews.com%252Ffiles%252F2014%252F07%252Fimage_full5.gif%3Bhttp%253A%252F%252Fthescoopblog.dallasnews.com%252F2014%252F07%252Fdallas-highs-will-be-below-normal-next-week-and-it-may-rain-but-thats-not-the-return-of-the-polar-votex.html%252F%3B1272%3B897


https://en.wikipedia.org/wiki/Polar_vortex

Polar vortex

From Wikipedia, the free encyclopedia

polar vortex is a persistent, large-scale cyclone that circles either of the planet's geographical poles. On Earth, the base of the polar vortices are located in the middle and upper troposphere and extend into the stratosphere. They surround the polar highs and lie in the wake of the polar front. These cold-core low-pressure areas strengthen in the winter and weaken in the summer due to their dependance upon the temperature differential between the equator and the poles.[1] They usually span less than 1,000 kilometers (620 miles) in diameter within which the air circulates in a counter-clockwise fashion in the Northern Hemisphere, and in a clockwise fashion in the Southern Hemisphere. As with other cyclones, their rotation is caused by the Coriolis effect.
The Northern Hemisphere vortex often contain two low pressure centers, one near Baffin Island, Canada and the other over northeast Siberia.[2] Within the Antarctic vortex in the Southern Hemisphere a single low pressure zone tends to be located near the edge of the Ross ice shelf near 160 west longitude. When the polar vortex is strong, the Westerliesincrease in strength. When the polar cyclone is weak, the general flow pattern across mid-latitudes buckles and significant cold outbreaks occur.[3] Ozone depletion occurs within the polar vortex, particularly over the Southern Hemisphere, and reaches a maximum in the spring.

History[edit]

The polar vortex was first described as early as 1853.[4] The phenomenon's sudden stratospheric warming (SSW) appears during the winter in the Northern Hemisphere and was discovered in 1952 with radiosonde observations at altitudes higher than 20 km.[5]

Identification[edit]

Polar cyclones are climatological features that hover near the poles year-round. The stratospheric polar vortex develops pole-ward and above the subtropical jet stream.[6] Since polar vortices exist from the stratosphere downward into the mid-troposphere,[2] a variety of heights/pressure levels within the atmosphere can be checked for its existence. Within the stratosphere, strategies such as the use of the 4 mb pressure surface, which correlates to the 1200K isentropic surface, located midway up the stratosphere, is used to create climatologies of the feature.[7] Due to model data unreliability, other techniques use the 50 mb pressure surface to identify its stratospheric location.[8] At the level of the tropopause, the extent of closed contours of potential temperature can be used to determine its strength. Horizontally, most polar vortices have a radius of less than 1,000 kilometres (620 mi).[9] Others have used levels down to the 500 hPa pressure level (about 5,460 metres (17,910 ft) above sea level during the winter) to identify the polar vortex.[10]

Duration and power[edit]


Polar vortex and weather impacts due to stratospheric warming
Polar vortices are weaker during summer and strongest during winter. Individual vortices can persist for more than a month.[9] Extratropical cyclonesthat occlude and migrate into higher latitudes create cold-core lows within the polar vortex.[11] Volcanic eruptions in the tropics lead to a stronger polar vortex during the winter for as long as two years afterwards.[12] The strength and position of the cyclone shapes the flow pattern across the hemisphere of its influence. An index which is used in the northern hemisphere to gauge its magnitude is the Arctic oscillation.[13]
The Arctic vortex is elongated in shape, with two centers, one normally located over Baffin Island in Canada and the other over northeast Siberia. Around the North Pole, the Arctic vortex spins counterclockwise with wind speeds of 80 mph, stronger than the jet stream's normal 70 mph winds.[14] In rare events, when the general flow pattern is amplified (or meridional), the vortex can push farther south as a result of axis interruption, such as during the Winter 1985 Arctic outbreak.[15] The Antarctic polar vortex is more pronounced and persistent than the Arctic one; this is because the distribution of land masses at high latitudes in the Northern Hemisphere gives rise to Rossby waves which contribute to the breakdown of the vortex, whereas in the Southern Hemisphere the vortex remains less disturbed. The breakdown of the polar vortex is an extreme event known as a sudden stratospheric warming, here the vortex completely breaks down and an associated warming of 30–50 °C (54–90 °F) over a few days can occur.
The formation of the polar vortex is primarily influenced by the movement of wind and transfer of heat in the polar region. In the autumn, the circumpolar winds increase in speed, causing the polar vortex to spin up further into the stratosphere and the values of potential vorticity to heighten, forming a coherent air mass: the polar vortex. As the winter comes, the winds around the poles decrease, and the air in the vortex core cools. The movement of the air becomes slow, and the vortex stops growing.Once late winter and early spring approach, heat and wind circulation return, causing the vortex to shrink. During the final warming, or the late winter, large fragments of the vortex air are drawn out into narrow pieces into lower latitudes. In the bottom level of the stratosphere, strong potential vorticity gradients remain, and the majority of air molecules remain confined into December in the Southern Hemisphere and April in the Northern Hemisphere, well after the breakup of the vortex in the mid-stratosphere.[16]
The breakup of the polar vortex occurs between middle March to middle May, the average date being April 10. This event signifies the transition from winter to spring, and has impacts on thehydrological cycle, growing seasons of vegetation, and overall ecosystem productivity. The timing of the transition also influences differences in sea ice, ozone, air temperature, and cloudiness. Early and late polar breakup episodes have occurred, due to variations in the stratospheric flow structure and upward spreading of planetary waves from the troposphere. As a result of increased waves into the vortex, the vortex experiences higher amounts of heat sooner than the normal warming period, resulting in a faster season transition from winter to summer. As for late breakups, the waves dismantle the vortex later than normal, causing a delay in the season transition. The early breakup years are also characterized with persistence of remnants of the vortex, while the late breaking years have a quick disappearance of these remnants. In the early breakup phases, only one warming period occurs from late February to middle March, contrasting to the two warming periods that the late breakup phases have in January and March. Zonal mean temperature, wind, and geopotential height exert varying deviations from their normal values before and after early breakups, while the deviations remain constant before and after late breakups. Scientists are connecting a delay in the Arctic vortex breakup with a reduction of planetary wave activities, few stratospheric sudden warming events, and depletion of ozone.[17][18]
Sudden stratospheric warming events, when temperatures within the stratosphere warm dramatically over a short time, are associated with weaker polar vortices. This warming of stratospheric air can cause the direction of circulation in the Arctic Polar Vortex to go from counter-clockwise to clockwise.[19] These changes aloft force changes below in the troposphere. An example of an effect on the troposphere is the change in speed of the Atlantic Ocean circulation pattern. A soft spot just south of Greenland is where the initial step of downwelling occurs, nicknamed the "Achilles Heel of the North Atlantic". Small amounts of heating or cooling traveling from the polar vortex can trigger or delay downwelling, causing circulation of heat through the Atlantic ocean currents to be stopped or sped up. Since all other oceans depend on the Atlantic ocean for the transmission of heat and energy, climates across the planet can change dramatically. The weakening or strengthening of the polar vortex can alter the sea circulation more than one mile below the waves.[20] Strengthening storm systems within the troposphere can act to intensify the polar vortex by significantly cooling the poles. La Niña–related climate anomalies tend to favor significant strengthening of the polar vortex.[21] Intensification of the polar vortex is also associated with changes in relative humidity as downward intrusions of dry, stratospheric air enter into the vortex core. With a strengthening of the vortex comes a longwave cooling due to a decrease in water vapor concentration near the vortex. The decreased water content is a result of a lower tropopause within the inside of the vortex, which places dry stratospheric air above moist tropospheric air.[22] Instability is caused when the vortex tube, the line of concentrated vorticity, is displaced. When this occurs, the vortex rings become more unstable and prone to shifting by planetary waves.The planetary wave activity in both hemispheres varies year-to-year, producing a corresponding response in the strength and temperature of the polar vortex.[23] The number of waves around the perimeter of the vortex are related to the core size; as the vortex core decreases, the number of waves increase.[24]
The degree of the mixing of polar and mid-latitude air depends on the evolution and position of the polar night jet.In general, the combination of these two remains small inside the vortex compared to the outside. Mixing occurs with unstable planetary waves that are characteristic of the middle and upper stratosphere in winter.Prior to vortex breakdown, there is little transport of air out of the Arctic Polar Vortex due to strong barriers exist above 420 km (261 miles). Below this barrier exists the polar night jet, which is weak in the early winter, so any descending polar air mixes with the mid-latitudes. In the late winter, air parcels do not descend as much, causing mixing to be less frequent.[25] After the vortex is broken up, the ex-vortex air is dispersed into the middle latitudes within a month.[26]
Sometimes, a piece of the polar vortex can be broken off before the end of the final warming period. If large enough, the piece can plunge over Canada and the Midwestern, Central, Southern, and Northeastern United States. This diversion of the polar vortex can occur due to the displacement of the polar jet stream, such as the significant northwestern push of the polar jet stream over the western part of the United States in the winter of 2013–2014. Occasionally, the high-pressure Greenland Block can cause the low pressure polar vortex to divert to the south instead of sweeping across the North Atlantic.[27]

Climate change[edit]


Meanders of the northern hemisphere's jet stream developing (a, b) and finally detaching a "drop" of cold air (c); orange: warmer masses of air; pink: jet stream
A study in 2001 found that stratospheric circulation can have anomalous effects on weather regimes.[28] In the same year researchers found a statistical correlation between weak polar vortex and outbreaks of severe cold in the Northern Hemisphere.[29][30] In more recent years scientists identified interactions with Arctic sea ice decline, reduced snow cover, evapotranspiration patterns, NAO anomalies or weather anomalies which are linked to the polar vortex and jet stream configuration.[28][30][31][32][33][34][35][36] However, because the specific observations are considered short-term observations (starting c. 13 years ago) there is considerable uncertainty in the conclusions.Climatology observations require several decades to definitively distinguish natural variability from climate trends.

Southern Hemisphere Ozone Concentration, February 22, 2012
The general assumption is that reduced snow cover and sea ice reflect less sunlight and therefore evaporation and transpiration increases, which in turn alters the pressure and temperature gradient of the polar vortex, causing it to weaken or collapse. This becomes apparent when the jet stream amplitude increases (meanders) over the northern hemisphere, causing Rossby waves to propagate farther to the south or north, which in turn transports warmer air to the north pole and polar air into lower latitudes. The jet stream amplitude increases with a weaker polar vortex, hence increases the chance for weather systems to become blocked. A recent blocking event emerged when a high-pressure over Greenland steered Hurricane Sandy into the northern Mid-Atlantic states.[37]

Ozone depletion[edit]

The chemistry of the Antarctic polar vortex has created severe ozone depletion. The nitric acid in polar stratospheric clouds reacts withchlorofluorocarbons to form chlorine, which catalyzes the photochemical destruction of ozone.[38] Chlorine concentrations build up during the polar winter, and the consequent ozone destruction is greatest when the sunlight returns in spring.[39] These clouds can only form at temperatures below about −80 °C (−112 °F). Since there is greater air exchange between the Arctic and the mid-latitudes, ozone depletion at the north pole is much less severe than at the south.[40] Accordingly, the seasonal reduction of ozone levels over the Arctic is usually characterized as an "ozone dent", whereas the more severe ozone depletion over the Antarctic is considered an "ozone hole". This said, chemical ozone destruction in the 2011 Arctic polar vortex attained, for the first time, a level clearly identifiable as an Arctic "ozone hole".[citation needed]













https://plus.google.com/u/0/photos/117645114459863049265/albums/6035299934440634481


Thanks to the jets for the clouds.










https://plus.google.com/u/0/photos/117645114459863049265/albums/6035304011631065697







https://plus.google.com/u/0/photos/117645114459863049265/albums/6035288669430222305






...this is brendasue signing off from Rainbow Creek.  See you next time! Look Up!


O+O